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Date:      Sun, 25 Apr 1999 20:31:28 -0700
From:      "Greg Shaffer" <gshaffer@leaky.com>
To:        <current@freebsd.org>
Cc:        <gshaffer@leaky.com>
Subject:   Fatal Trap 12
Message-ID:  <000101be8f95$45256410$024ab8c7@aegis.leaky.com>

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I updated my source tree, successfully did a make buildworld and
installworld. Rebuilt the kernel. Upon reboot I encountered the 
following trap. 

Fatal Trap 12: page fault while in kernel mode
mp_lock = 00000002;  cpuid = 0; lapic.id = 00000000
fault virtual address	= 0xbfc00000
fault code			= supervisor read, page not present
instruction pointer	= 0x8:0xc01dc935
stack pointer		= 0x10:0xc0295ed8
frame pointer		= 0x10:0xc0295ed8
code segment		= base 0x0  limit 0xfffff  type 0x1b
				= DPL 0, page 1, def32 1, gran 1
processor eflags		= interrupt enabled, resume, IOPL=0
current process		= 0 ()
interrupt mask		= net tty bio cam <- SMP:XXX
trap number			= 12
mp_lock = 00000002; cpuid = 0; lapic.id = 00000000

When it dropped into ddb I got the following:

stopped at	kvtop+0x2d:	movl PTmap(,%eax,4),%edx

At trace in ddb provides the following:
kvtop(0) at kvtop+0x2d
isa_compat_probe(...) at isa_compat_probe+0x297
DEVICE_PROBE(...) at DEVICE_PROBE+0x25
device_probe_child(...) at device_probe_child+0x4a
device_probe_and_attach(...) at device_probe_and_attach+0x25
bus_generic_attach(...) at bus_generic_attach+0x16
configure(0) at configure+0x46
main at main+0x83
begin at begin+0x55

This is an dual 233MMX system with hardware I have been
using for several years without any problems.

The last kernel I built was on 4 April. Everything worked 
fine. Also, the GENERIC kernel does works. I have looked
through my config file and compared it against GENERIC
and nothing seems to be out of wack. The fault occured
right after probing the ppbus. I thought that might be
the problem, but commenting out the ppbus stuff does not
prevent it from faulting.

Any suggenstions would be appriciated.

Thanks
Greg Shaffer





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